What Is the Significance of the J Region of The \kappa

Multiple Choice

What is the significance of the J region of the $\kappa$ light-chain locus?

A) Multiple J sites contribute to antibody diversity.
B) It provides a unique joining site for J and V genes, which is always the same.
C) It provides numerous sites for linkage to the V genes.
D) A and B are both correct.
E) A and C are both correct.